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Styles of Application Integration
    Using Spring
    Bruce Snyder, Senior Software Engineer, SpringSource/VMware




Friday, July 15, 2011
Integrations Are About Coupling




                                      2

Friday, July 15, 2011
Where Coupling Exists, Concerns Arise

    • Tight coupling is easy
    • Loose coupling can be difficult

    • Tight coupling causes issues in the long run
    • Loose coupling pays off in the long run

    • Integrations are usually tightly coupled
    • Integrations should be loosely coupled

    • Integrations are commonly addressed using commands
    • Integrations should be addressed using events


Friday, July 15, 2011
What is Coupling?

           “... the degree to which each program module relies
           on each one of the other modules”
           (Wikipedia.com)



    • Given two lines of code, A and B, they are coupled when B
      must change behavior only because A changed




                                                                 4

Friday, July 15, 2011
Characteristics Tight Coupling

    •    Components are highly dependent upon one another
    •    Components are directly linked
    •    Changes in one component cause a ripple effect
    •    Less reusability
    •    More difficult to maintain
    •    Does not handle unforeseen change well

    • Examples
          – Clients designed to interact only with specific systems
          – Use of proprietary APIs or commands for interaction
          – Components designed to work specifically with other
            components
                                                                      5

Friday, July 15, 2011
Characteristics of Loose Coupling

    •    Components have little or no knowledge of one another
    •    Components are not directly linked to one another
    •    Changes in one component do not affect other components
    •    Increased reusability
    •    Easier to maintain
    •    More easily handles unforeseen changes

    • Examples
          – Dependence upon interfaces instead of concrete classes
          – Use of DI encourages looser coupling
          – A design using a level of indirection


                                                                     6

Friday, July 15, 2011
Tight Coupling is Easy

    •    App design with tight coupling is more widely understood
    •    App development with tight coupling requires less time
    •    Debugging a tightly coupled app is easier
    •    Benefits of tight coupling are seen immediately
    •    Tightly coupled prototypes commonly live on




                                                                    7

Friday, July 15, 2011
Loose Coupling is Difficult

    • App design with loose coupling is not widely understood
    • App development with loosely coupling requires more
      thought and more time
    • Debugging loosely coupled apps is different
    • Benefits of loose coupling are only seen over time




                                                                8

Friday, July 15, 2011
Integrations and Coupling

    • But it’s easy to write a point-to-point, one-off piece of code
      for integration!
    • Too many disadvantages
          –    Difficult to maintain
          –    No reusability
          –    Every integration is unique
          –    Bites you over time




                                                                  9

Friday, July 15, 2011
Integrations and Coupling

    • But designing integrations to be loosely coupled requires
      too much work!
    • With the right knowledge and preparation, it doesn’t need
      to be this way




                                                              10

Friday, July 15, 2011
Commands vs. Events

    • Commands are not natural
          – Verify credit card
    • Commands are too specific

    • Events are natural
          – Order received
    • Events are more broad
    • Events are what happen in the real world




                                                 11

Friday, July 15, 2011
Enterprise Integration Patterns (EIP)




                        http://enterpriseintegrationpatterns.com/
                                                                    12

Friday, July 15, 2011
Spring Integration

    • Provides both concurrency and messaging
          – Message Endpoints
                 • Connections between services
          – Channel Adapters
                 • Adapter between application and message broker
          – Messaging Gateways
                 • Provides uni-directional or bi-directional messaging
          – Service Activators
                 • Invokes a services based on an incoming message
          – Routers
                 • Determines where to dispatch a message
          – Splitters and Aggregators
                 • Breaks up a message and reassembles it after processing

                                                                             13

Friday, July 15, 2011
Spring Integration

    • Supports
          –    AMQP
          –    Email
          –    File system
          –    Gemfire
          –    JMS
          –    JMX
          –    MongoDB
          –    Redis
          –    Spring Batch
          –    Testing
          –    Web Services

                              14

Friday, July 15, 2011
Spring Integration




                         15

Friday, July 15, 2011
Spring Integration




                         16

Friday, July 15, 2011
Spring Integration




                         17

Friday, July 15, 2011
Spring Integration




                         18

Friday, July 15, 2011
Spring Integration




                         19

Friday, July 15, 2011
Spring Integration




                         20

Friday, July 15, 2011
Spring Integration




                         21

Friday, July 15, 2011
Spring Integration




                         22

Friday, July 15, 2011
Spring Integration




                         23

Friday, July 15, 2011
Spring Integration




                         24

Friday, July 15, 2011
Types of Integration

    • Intra-application integration
    • Inter-application integration
    • External system integration




                                      25

Friday, July 15, 2011
Typical Application Layers




                                 26

Friday, July 15, 2011
Intra-Application Integration




                                    27

Friday, July 15, 2011
Spring Integration Config



   <int:gateway id="sender"
     service-interface="org.bsnyder.spring.integration.simple.Sender"/>

   <int:channel id="orderReceived"/>

   <int:service-activator input-channel="orderReceived" ref="receiver"
   method="receive" />

   <bean id="receiver" class="org.bsnyder.spring.integration.simple.Receiver"/>




                                                                                  28

Friday, July 15, 2011
Intra-Application Integration




                                    29

Friday, July 15, 2011
Spring Integration Config
   <int:gateway id="sender"
     service-interface="org.bsnyder.spring.integration.appa.Sender"/>

   <channel id="orderReceived" />

   <amqp:outbound-channel-adapter channel="orderReceived"
     exchange-name="order.received.exchange"
     routing-key="order.received.binding"
     amqp-template="amqpTemplate" />


   <rabbit:connection-factory id="connectionFactory" />
   <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" />
   <rabbit:admin connection-factory="connectionFactory" />
   <rabbit:queue name="order.received.queue" />
   <rabbit:direct-exchange name="order.received.exchange">
      <rabbit:bindings>
      <rabbit:binding queue="order.received.queue" key="order.received.binding" />
      </rabbit:bindings>
   </rabbit:direct-exchange>


                                                                                     30

Friday, July 15, 2011
Spring Integration Config

   <amqp:inbound-channel-adapter channel="orderReceived"
     queue-names="order.received.queue"
     connection-factory="connectionFactory" />

   <int:service-activator input-channel="orderReceived" ref="receiver"
   method="receive" />

   <bean id="receiver" class="org.bsnyder.spring.integration.appa.Receiver"/>


   <rabbit:connection-factory id="connectionFactory" />
   <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" />
   <rabbit:admin connection-factory="connectionFactory" />
   <rabbit:queue name="order.received.queue" />
   <rabbit:direct-exchange name="order.received.exchange">
      <rabbit:bindings>
      <rabbit:binding queue="order.received.queue" key="order.received.binding" />
      </rabbit:bindings>
   </rabbit:direct-exchange>


                                                                                     31

Friday, July 15, 2011
32

Friday, July 15, 2011
Inter-Application Integration




                                    33

Friday, July 15, 2011
Inter-Application Integration




                                    34

Friday, July 15, 2011
Spring Integration Config
   <int:gateway id="sender"
     service-interface="org.bsnyder.spring.integration.appa.Sender"/>

   <channel id="orderReceived" />

   <amqp:outbound-channel-adapter channel="orderReceived"
     exchange-name="order.received.exchange"
     routing-key="order.received.binding"
     amqp-template="amqpTemplate" />


   <rabbit:connection-factory id="connectionFactory" />
   <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" />
   <rabbit:admin connection-factory="connectionFactory" />
   <rabbit:queue name="order.received.queue" />
   <rabbit:direct-exchange name="order.received.exchange">
      <rabbit:bindings>
      <rabbit:binding queue="order.received.queue" key="order.received.binding" />
      </rabbit:bindings>
   </rabbit:direct-exchange>


                                                                                     35

Friday, July 15, 2011
Spring Integration Config

   <amqp:inbound-channel-adapter channel="orderReceived"
     queue-names="order.received.queue"
     connection-factory="connectionFactory" />

   <int:service-activator input-channel="orderReceived" ref="receiver"
   method="receive" />

   <bean id="receiver" class="org.bsnyder.spring.integration.appb.Receiver"/>


   <rabbit:connection-factory id="connectionFactory" />
   <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" />
   <rabbit:admin connection-factory="connectionFactory" />
   <rabbit:queue name="order.received.queue" />
   <rabbit:direct-exchange name="order.received.exchange">
      <rabbit:bindings>
      <rabbit:binding queue="order.received.queue" key="order.received.binding" />
      </rabbit:bindings>
   </rabbit:direct-exchange>


                                                                                     36

Friday, July 15, 2011
37

Friday, July 15, 2011
External System Integration




                                  38

Friday, July 15, 2011
Spring Integration Config


   <int:gateway id="sender"
     service-interface="org.bsnyder.spring.integration.appa.Sender"/>


   <bean id="ftpClientFactory"
   class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory"
     p:host" value="localhost" p:username" value="${user}" p:password="$
   {password}"/>
   !
   <int:channel id="ftpChannel"/>

   <int-ftp:outbound-channel-adapter id="ftpOutbound"
     channel="ftpChannel"
     remote-directory="/foo/bar/baz/"
     client-factory="ftpClientFactory"/>




                                                                                  39

Friday, July 15, 2011
Spring Integration Config

   <int:channel id="ftpChannel">
      <int:queue/>
   </int:channel>

   <bean id="ftpClientFactory"
      class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory"
      p:host="localhost" p:username="${user}" p:password="${password}"/>
   !
   <int-ftp:inbound-channel-adapter id="ftpInbound"
      channel="ftpChannel" session-factory="ftpClientFactory"
      filename-regex=".*.txt$" auto-create-local-directory="true"
      delete-remote-files="false" remote-directory="/foo/bar/baz/"
      local-directory="file:local-target-dir">
      <int:poller fixed-rate="1000"/>
   </int-ftp:inbound-channel-adapter>

   <int:service-activator input-channel="ftpChannel" ref="receiver" method="receive" />

   <bean id="receiver" class="org.bsnyder.spring.integration.appb.Receiver"/>


                                                                                     40

Friday, July 15, 2011
41

Friday, July 15, 2011
Combined Integration




                           42

Friday, July 15, 2011
Thank You!




           Q&A




Friday, July 15, 2011

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Styles of Applicaton Integration Using Spring

  • 1. Styles of Application Integration Using Spring Bruce Snyder, Senior Software Engineer, SpringSource/VMware Friday, July 15, 2011
  • 2. Integrations Are About Coupling 2 Friday, July 15, 2011
  • 3. Where Coupling Exists, Concerns Arise • Tight coupling is easy • Loose coupling can be difficult • Tight coupling causes issues in the long run • Loose coupling pays off in the long run • Integrations are usually tightly coupled • Integrations should be loosely coupled • Integrations are commonly addressed using commands • Integrations should be addressed using events Friday, July 15, 2011
  • 4. What is Coupling? “... the degree to which each program module relies on each one of the other modules” (Wikipedia.com) • Given two lines of code, A and B, they are coupled when B must change behavior only because A changed 4 Friday, July 15, 2011
  • 5. Characteristics Tight Coupling • Components are highly dependent upon one another • Components are directly linked • Changes in one component cause a ripple effect • Less reusability • More difficult to maintain • Does not handle unforeseen change well • Examples – Clients designed to interact only with specific systems – Use of proprietary APIs or commands for interaction – Components designed to work specifically with other components 5 Friday, July 15, 2011
  • 6. Characteristics of Loose Coupling • Components have little or no knowledge of one another • Components are not directly linked to one another • Changes in one component do not affect other components • Increased reusability • Easier to maintain • More easily handles unforeseen changes • Examples – Dependence upon interfaces instead of concrete classes – Use of DI encourages looser coupling – A design using a level of indirection 6 Friday, July 15, 2011
  • 7. Tight Coupling is Easy • App design with tight coupling is more widely understood • App development with tight coupling requires less time • Debugging a tightly coupled app is easier • Benefits of tight coupling are seen immediately • Tightly coupled prototypes commonly live on 7 Friday, July 15, 2011
  • 8. Loose Coupling is Difficult • App design with loose coupling is not widely understood • App development with loosely coupling requires more thought and more time • Debugging loosely coupled apps is different • Benefits of loose coupling are only seen over time 8 Friday, July 15, 2011
  • 9. Integrations and Coupling • But it’s easy to write a point-to-point, one-off piece of code for integration! • Too many disadvantages – Difficult to maintain – No reusability – Every integration is unique – Bites you over time 9 Friday, July 15, 2011
  • 10. Integrations and Coupling • But designing integrations to be loosely coupled requires too much work! • With the right knowledge and preparation, it doesn’t need to be this way 10 Friday, July 15, 2011
  • 11. Commands vs. Events • Commands are not natural – Verify credit card • Commands are too specific • Events are natural – Order received • Events are more broad • Events are what happen in the real world 11 Friday, July 15, 2011
  • 12. Enterprise Integration Patterns (EIP) http://enterpriseintegrationpatterns.com/ 12 Friday, July 15, 2011
  • 13. Spring Integration • Provides both concurrency and messaging – Message Endpoints • Connections between services – Channel Adapters • Adapter between application and message broker – Messaging Gateways • Provides uni-directional or bi-directional messaging – Service Activators • Invokes a services based on an incoming message – Routers • Determines where to dispatch a message – Splitters and Aggregators • Breaks up a message and reassembles it after processing 13 Friday, July 15, 2011
  • 14. Spring Integration • Supports – AMQP – Email – File system – Gemfire – JMS – JMX – MongoDB – Redis – Spring Batch – Testing – Web Services 14 Friday, July 15, 2011
  • 15. Spring Integration 15 Friday, July 15, 2011
  • 16. Spring Integration 16 Friday, July 15, 2011
  • 17. Spring Integration 17 Friday, July 15, 2011
  • 18. Spring Integration 18 Friday, July 15, 2011
  • 19. Spring Integration 19 Friday, July 15, 2011
  • 20. Spring Integration 20 Friday, July 15, 2011
  • 21. Spring Integration 21 Friday, July 15, 2011
  • 22. Spring Integration 22 Friday, July 15, 2011
  • 23. Spring Integration 23 Friday, July 15, 2011
  • 24. Spring Integration 24 Friday, July 15, 2011
  • 25. Types of Integration • Intra-application integration • Inter-application integration • External system integration 25 Friday, July 15, 2011
  • 26. Typical Application Layers 26 Friday, July 15, 2011
  • 27. Intra-Application Integration 27 Friday, July 15, 2011
  • 28. Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.simple.Sender"/> <int:channel id="orderReceived"/> <int:service-activator input-channel="orderReceived" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.simple.Receiver"/> 28 Friday, July 15, 2011
  • 29. Intra-Application Integration 29 Friday, July 15, 2011
  • 30. Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.appa.Sender"/> <channel id="orderReceived" /> <amqp:outbound-channel-adapter channel="orderReceived" exchange-name="order.received.exchange" routing-key="order.received.binding" amqp-template="amqpTemplate" /> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 30 Friday, July 15, 2011
  • 31. Spring Integration Config <amqp:inbound-channel-adapter channel="orderReceived" queue-names="order.received.queue" connection-factory="connectionFactory" /> <int:service-activator input-channel="orderReceived" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.appa.Receiver"/> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 31 Friday, July 15, 2011
  • 33. Inter-Application Integration 33 Friday, July 15, 2011
  • 34. Inter-Application Integration 34 Friday, July 15, 2011
  • 35. Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.appa.Sender"/> <channel id="orderReceived" /> <amqp:outbound-channel-adapter channel="orderReceived" exchange-name="order.received.exchange" routing-key="order.received.binding" amqp-template="amqpTemplate" /> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 35 Friday, July 15, 2011
  • 36. Spring Integration Config <amqp:inbound-channel-adapter channel="orderReceived" queue-names="order.received.queue" connection-factory="connectionFactory" /> <int:service-activator input-channel="orderReceived" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.appb.Receiver"/> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 36 Friday, July 15, 2011
  • 38. External System Integration 38 Friday, July 15, 2011
  • 39. Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.appa.Sender"/> <bean id="ftpClientFactory" class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory" p:host" value="localhost" p:username" value="${user}" p:password="$ {password}"/> ! <int:channel id="ftpChannel"/> <int-ftp:outbound-channel-adapter id="ftpOutbound" channel="ftpChannel" remote-directory="/foo/bar/baz/" client-factory="ftpClientFactory"/> 39 Friday, July 15, 2011
  • 40. Spring Integration Config <int:channel id="ftpChannel"> <int:queue/> </int:channel> <bean id="ftpClientFactory" class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory" p:host="localhost" p:username="${user}" p:password="${password}"/> ! <int-ftp:inbound-channel-adapter id="ftpInbound" channel="ftpChannel" session-factory="ftpClientFactory" filename-regex=".*.txt$" auto-create-local-directory="true" delete-remote-files="false" remote-directory="/foo/bar/baz/" local-directory="file:local-target-dir"> <int:poller fixed-rate="1000"/> </int-ftp:inbound-channel-adapter> <int:service-activator input-channel="ftpChannel" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.appb.Receiver"/> 40 Friday, July 15, 2011
  • 42. Combined Integration 42 Friday, July 15, 2011
  • 43. Thank You! Q&A Friday, July 15, 2011